Again traffic shaping can be the reason utorrent is blazing fast. If you get 5mb ps for the first 20 seconds of every connection and your making over 5000 connections per second on utorrent all to different people your going to get your max speed where as on limewire and winmx your making one connection to one person for a very long time. and they can prolly only get about 300kb/s max. if you get shaped then well..